ConvEx
 | Purpose of the program |  |
The ConvEx program is intended for the simulation of explosions in in fluids when convection and diffusion are of significant importance. Simulation of a problem is implemented by simultaneous numerical solving the system of partial differential equations consisting of: the continuity equation, the momentum balance equation, the heat balance equation, the component balance equations (Boussinesq approximation of Navier-Stokes equations), and equation for chemical source of heat generation. Thermal explosion simulation provides: - determining critical conditions (size of reacting system, environment temperature, induction period, etc.);
- analyzing the behavior of a system under extraordinary external conditions (fire, etc.);
- estimating the influence of package walls or other constructional details on explosion development, etc.
| Storing data | |
ConvEx provides storage of data into internal database. Database consists of data volumes. Every data volume includes number of data sets; each data set may represent kinetics, operational conditions, and physical properties of a substance. ConvEx allows saving projects. Every project includes all the information prepared for simulation - kinetic model, operational conditions, and physical properties of a substance. | Type of kinetic models | |
ConvEx allows application of both formal and descriptive models. For this purpose two versions of the software are issued CE-FK for handling formal kinetic models and CE-DK for applying descriptive models. | Type of reactor's models | |
A reaction is considered to proceed in a batch reactor. The following shapes are available: - horizontal infinite cylinder;
- vertical cylinder with limited length (barrel).
| Boundary conditions | |
The boundary conditions of the first, second, and third kind can be defined for every side of a reactor independently. | Simulation module | |
Simulation module provides simulation of thermal explosion and has the following features: - User's accuracy control of numerical integration method;
- possibility to save current sate of the task for continuing simulation during the next session;
- visualizing variation of maximal temperature and conversions on time in on-line mode; optionally temperature and conversions in any point can be visualized instead;
- visualizing stream lines and contours of constant temperature in on-line mode;
- automatic determination of induction time of thermal explosion.
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